Re: [appengine-java] Where is the datastore file on windows?
It's located at Eclipse workspace\Your app\war\WEB-INF\appengine-generated ... On Sun, Jun 13, 2010 at 3:25 PM, quqtalk quqt...@gmail.com wrote: Use below Java code: private static final PersistenceManagerFactory pmfInstance = JDOHelper.getPersistenceManagerFactory(transactions-optional); Category c1 = new Category(); c1.setCategoryId(FISH); c1.setDescription(image src=\../images/fish_icon.gif\font size=\5\ color=\blue\ Fish/font); c1.setName(FISH); pm.makePersistent(c1); Run it as Google Web Application in Eclipse on Windows. I think the App Engine persistent the data to the disk, any one know where is it? Or am I wrong? -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.comgoogle-appengine-java%2bunsubscr...@googlegroups.com . For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en. -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
Re: [appengine-java] Records Count
Can you please try: select count (this) from entity? This topic was discussed once or more in the group... On Fri, Jun 11, 2010 at 5:39 PM, RAVINDER MAAN rsmaan...@gmail.com wrote: How can we get records count for a query in JDO. In sql we have select count(*) from table_name i want to get number of records returned by a query. what is the efficient way to do that.One option is to use size() function .I think it is not best way. -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.comgoogle-appengine-java%2bunsubscr...@googlegroups.com . For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en. -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
[appengine-java] Re: Server Error A server error has occurred. - Whilst Deleting app version.
Hello Ikai, Can you please include my app in deleting batch as well: app id: gaepocdemo version: 3 Thank you On Apr 10, 5:47 am, Ikai L (Google) ika...@google.com wrote: We'll scrub these next time we do them in batch. For the time being - it's annoying that it's stuck there, but we allocate you 100 versions, so this shouldn't get in your way. On Wed, Apr 7, 2010 at 2:47 PM, Eurig Jones eurigjo...@gmail.com wrote: mailmymove - version 1 http://www.mailmymove.com On Apr 5, 9:51 pm, Ikai L (Google) ika...@google.com wrote: What's your application ID and the version you are trying to delete? On Mon, Apr 5, 2010 at 11:20 AM, Eurig Jones eurigjo...@gmail.com wrote: Hi, I'm getting a... Server Error A server error has occurred. Whilst trying to delete a particular version of an app. For the others it's no problem, but this particular version I cannot delete and I'm getting the Server error. Can anyone suggest what I can do about this? (Or where to report it at least) -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.comgoogle-appengine-java%2bunsubscr...@googlegroups.com google-appengine-java%2bunsubscr...@googlegroups.comgoogle-appengine-java%252bunsubscr...@googlegroups.com . For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en. -- Ikai Lan Developer Programs Engineer, Google App Enginehttp:// googleappengine.blogspot.com|http://twitter.com/app_engine -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.comgoogle-appengine-java%2bunsubscr...@googlegroups.com . For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en. -- Ikai Lan Developer Programs Engineer, Google App Enginehttp://googleappengine.blogspot.com|http://twitter.com/app_engine -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
Re: [appengine-java] Re: Transaction exception when not using a transaction ?
Did you have different entity groups inside a transaction?
Google have a constraint of what can be done in a transaction here
http://code.google.com/appengine/docs/python/datastore/transactions.html#What_Can_Be_Done_In_a_Transaction
On Fri, Jun 4, 2010 at 5:45 PM, JD liva...@gmail.com wrote:
After debugging, I was able to get rid of the exception by removing a
pm.newQuery() which was happening on a different entity group.
To me this is a bug in App Engine, as there is no reason the query on
a particular entity group should fail outside a transaction.
On Jun 3, 12:25 pm, Millisecond millisec...@gmail.com wrote:
Hmmm.
How is your object model structured? Do entities have other entities
as direct references?
If you have class A { B b } and setting b to an instance of B that
already existed might throw the error you're seeing.
I changed my structure to be class A { String bKey } for a variety
of other reasons, but guess it also may have gotten around this
problem.
Alternatively, post as much code as you can and I'll see if anything
else rings a bell, early on I spent a frustrated day or two working
around this exception in a variety of places so know it can be
frustrating.
-C
On Jun 3, 6:33 am, JD liva...@gmail.com wrote:
I added a call to flush() after every change on the PM-managed object,
but that did not help.
Also doing a pm.flush() does not throw this exception, but doing a
pm.close() does - which seems to be contrary to your reasoning (I
would expect flush to throw the same exception if multiple entity
groups were at cause).
On Jun 3, 1:33 am, Millisecond millisec...@gmail.com wrote:
Even though you're not using transactions, I think it's trying to
make
the .close() call atomic (maybe with an internal implicit
transaction), failing or succeeding as a whole. And as I understand
it, entities not in the same group can be stored on separate machines
so can't be operated on atomically.
I've worked around this by calling a flush() after most any change on
a PM-managed object until close(). If this has a huge number of
reqs/
s, you may want to re-architect to get the objects in the same entity
group as multiple flushes won't be very efficient.
-C
On Jun 2, 8:26 pm, JD liva...@gmail.com wrote:
I have a PersistenceManager
PersistenceManager pm = PMF.get().getPersistenceManager();
which I use to do a bunch of operations on different objects, but
WITHOUT transaction (run queries, store entities and lookup
entities).
I then close the manager with pm.close() and get this obscure error
that complains about multiple entity groups inside a transaction
even
though I am not using a transaction (you will notice that the error
is
not the usual one where it prints the different entity groups).
I am not 100% confident but have the impression that this error
started happening with the 1.3.4 release.
100% reproducible use case. Would appreciate input from App Engine
developers.
com.myapp.servlet.task.PopulateUserPages doAction: Illegal argument
javax.jdo.JDOFatalUserException: Illegal argument
at
org.datanucleus.jdo.NucleusJDOHelper.getJDOExceptionForNucleusException(Nuc
leusJDOHelper.java:
344)
at
org.datanucleus.jdo.JDOPersistenceManager.close(JDOPersistenceManager.java:
281)
at
com.myapp.dao.jdo.DatastoreService.release(DatastoreService.java:
631)
at
com.myapp.servlet.AbstractBaseServlet.releaseService(AbstractBaseServlet.ja
va:
243)
at
com.myapp.servlet.task.PopulateUserPages.doAction(PopulateUserPages.java:
132)
at
com.myapp.servlet.task.Dispatcher.doAction(Dispatcher.java:35)
at
com.myapp.servlet.task.TaskServlet.doAction(TaskServlet.java:36)
at
com.myapp.servlet.AbstractBaseServlet.doGenericAction(AbstractBaseServlet.j
ava:
194)
at
com.myapp.servlet.AbstractBaseServlet.doPost(AbstractBaseServlet.java:
84)
at
javax.servlet.http.HttpServlet.service(HttpServlet.java:713)
at
javax.servlet.http.HttpServlet.service(HttpServlet.java:806)
at
org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:
511)
at org.mortbay.jetty.servlet.ServletHandler
$CachedChain.doFilter(ServletHandler.java:1166)
at
com.google.apphosting.utils.servlet.ParseBlobUploadFilter.doFilter(ParseBlo
bUploadFilter.java:
97)
at org.mortbay.jetty.servlet.ServletHandler
$CachedChain.doFilter(ServletHandler.java:1157)
at
com.google.apphosting.runtime.jetty.SaveSessionFilter.doFilter(SaveSessionF
ilter.java:
35)
at org.mortbay.jetty.servlet.ServletHandler
[appengine-java] Re: Delete error version
Hello Google, I've just tried to delete the error version again and still no luck. The same issue report: Server Error. A server error has occurred. Can you help me delete this version 3. Thanks On May 27, 12:41 am, Chau Huynh cmhu...@gmail.com wrote: Hello Google, Can you please help me to delete an error version in my app? When I tried to delete it, the system reported Server Error. A server error has occurred. My app id: gaepocdemo Error version: 3 Thanks -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
Re: [appengine-java] How to use Key as filter
Check this out http://gae-java-persistence.blogspot.com/2010/01/querying-with-key-parameters.html Key is special datatype and you will need to use help API by Google to re-create the key before passing it in. On Sun, May 30, 2010 at 9:47 PM, Dormand mfjhs...@gmail.com wrote: Hi, I have a persistance class. now i want to query with its key and other one field. I have tried in this waya Query qry2 = pm.newQuery(File.class); qry2.setFilter(key == keyParam); qry2.setFilter(initialVersion = version); qry2.declareParameters(com.google.appengine.api.datastore.Key keyParam, long version); fileList = (ListFile) qry2.execute(key, version); but it do not show any result -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.comgoogle-appengine-java%2bunsubscr...@googlegroups.com . For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en. -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
[appengine-java] Delete error version
Hello Google, Can you please help me to delete an error version in my app? When I tried to delete it, the system reported Server Error. A server error has occurred. My app id: gaepocdemo Error version: 3 Thanks -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
Re: [appengine-java] Re: AppEngine gets very slow when not used for some time
Hi Rahul, About loading request/performance, there're lots of discussions that you can find in the groups, please just try google it. Here are some notes based on reading those. Latency causes by 1- time to start new JVM 2- time to load your application To reduce load time by 1) others star request to a) pay to reserve JVM b) request Google to load your app before start dispatch request to that instance c) accept the situation For 2) we try to a- try to use/replace frameworks with light-weight ones: datastore access framework, MVC framework,... b- try to limit calculation in your index page to alleviate the impact of loading request c- design your object model based on your need, so that you do calculation at insert time, not at query time. For example, in my app, if I want to report on year and quarter, then I have 5 summary record for those, instead of querying and computing those d- caching result. For example, If I know 1 one 5 piece of data above would be read frequently, then I will read those 5 all, and put into memcache for later use ... So it's application-specific, I don't know if each of above can help you. But only you who can know if which one of your code can be cached and how... HTH On Sun, May 23, 2010 at 11:37 AM, Rahul rahul.jun...@gmail.com wrote: Chau, Thanks for pointing to the link. I did go through the link and i think, what i thought was right. Also i was going through the following point in the section you provided : How can I speed up loading requests? and the second point mentioned is Share expensive initialization between JVMs. For example, put data which is expensive to read or compute into memcache, where it can be quickly read by other JVMs during startup. so in this scenario where do you load this memcache so that it can be shared between the jvm instances. Any pointers or clues highly appreciated. Thanks, Rahul On May 22, 10:51 pm, Chau Huynh cmhu...@gmail.com wrote: It seems like loading request... http://code.google.com/appengine/kb/java.html#What_Is_A_Loading_Request On Sun, May 23, 2010 at 4:55 AM, Rahul rahul.jun...@gmail.com wrote: I have an application running on appengine and no doubt it works great. but when the application is not used for some time. it goes very slow. Suppose i don;t use the application for around 5 hours or so, then next time when i try to use it, the response is very slow. Is there any thing specific which i am missing in adding application to appengine. Any clues are pointers are highly appreciated. Thanks, Rahul -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.comgoogle-appengine-java%2bunsubscr...@googlegroups.com google-appengine-java%2bunsubscr...@googlegroups.comgoogle-appengine-java%252bunsubscr...@googlegroups.com . For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en. -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.comgoogle-appengine-java%2bunsubscr...@googlegroups.com . For more options, visit this group athttp:// groups.google.com/group/google-appengine-java?hl=en. -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.comgoogle-appengine-java%2bunsubscr...@googlegroups.com . For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en. -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
Re: [appengine-java] AppEngine gets very slow when not used for some time
It seems like loading request... http://code.google.com/appengine/kb/java.html#What_Is_A_Loading_Request On Sun, May 23, 2010 at 4:55 AM, Rahul rahul.jun...@gmail.com wrote: I have an application running on appengine and no doubt it works great. but when the application is not used for some time. it goes very slow. Suppose i don;t use the application for around 5 hours or so, then next time when i try to use it, the response is very slow. Is there any thing specific which i am missing in adding application to appengine. Any clues are pointers are highly appreciated. Thanks, Rahul -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.comgoogle-appengine-java%2bunsubscr...@googlegroups.com . For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en. -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
Re: [appengine-java] appengine unaware code!
You can take a look on 4 types of key on app engine and choose what you want: http://code.google.com/appengine/docs/java/datastore/creatinggettinganddeletingdata.html#Keys On Sat, May 22, 2010 at 5:35 AM, aijazzz aija...@gmail.com wrote: Hi, I was looking to some examples to start my work on google appengine application and found out that I have to use appengine related code in source. For example, in a database example I found this, import com.google.appengine.api.datastore.Key; I am wondering if there is a way I can keep my code clean so that I can use same code in another environment? Please suggest. Thanks. regards, Ijaz -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.comgoogle-appengine-java%2bunsubscr...@googlegroups.com . For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en. -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
Re: [appengine-java] delete the entries in the datastore
Have you tried searching the groups, this topic was discussed in detail with experience shared.. http://groups.google.com/group/google-appengine-java/search?group=google-appengine-javaq=delete+all+entitiesqt_g=Search+this+group In summary, advise from the group is to use Task Queue to work on mass volume data. On Sat, May 22, 2010 at 7:41 AM, drift elysium drift2elys...@gmail.comwrote: Hi all, Is there a way to delete all the entries in the datastore after deploying the application to the app engine? Thanks -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.comgoogle-appengine-java%2bunsubscr...@googlegroups.com . For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en. -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
Re: [appengine-java] Re: Persistent Identity of JPA Entities
I just wonder if you need an unique ID only, then you can let Google do it for you (sorry if this interrupted your discussion) http://code.google.com/appengine/docs/java/javadoc/com/google/appengine/api/datastore/DatastoreService.html#allocateIds%28com.google.appengine.api.datastore.Key,%20java.lang.String,%20long%29 On Thu, May 20, 2010 at 11:45 AM, Luca luca.mas...@gmail.com wrote: Some more infos. The behavious of DataNucleus depends on the strategy I choose to generate the @Id field. When I use GAE I always use the GenerationType.IDENTITY because I read that on JDO docs (http://code.google.com/appengine/docs/java/datastore/ dataclasses.htmlhttp://code.google.com/appengine/docs/java/datastore/%0Adataclasses.html: Primary keys of type Key require a @PrimaryKey annotation and a @Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY) annotation) and I saw that GAE documentation about JDO is usually more deep that JPA documentation. But If I choose GenerationType.AUTO then I see that also DataNucleus, like all the other persistence provider, generate the key after the persist and before the flush/commit. Very strange indeed because for H2 DataBase the AUTO should choose IDENTITY generation. I'm still more convinced this is a bug in DataNucleus that affect the way we work on Google App Engine. On 19 Mag, 07:26, datanucleus andy_jeffer...@yahoo.com wrote: I've already asked you twice to post your class. You haven't. That provides no context for any comment, and I've already told you why datastore operations are delayed until commit/flush. Why do you think there's a flush() method if you think things ought to go straight to the datastore ? JPA2 spec page 29 footnote 12. spec[12] If the application does not set the primary key attribute corresponding to the relationship, the value of that attribute may not be available until after the entity has been flushed to the database./ spec spec/** * Synchronize the persistence context to the underlying database. * @throws PersistenceException if the flush fails */ public void flush();/spec spec• If X is a new entity, it becomes managed. The entity X will be entered into the database at or before transaction commit or as a result of the flush operation./ spec http://www.datanucleus.org/products/accessplatform/jpa/transaction_ty... End. -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.comgoogle-appengine-java%2bunsubscr...@googlegroups.com . For more options, visit this group athttp:// groups.google.com/group/google-appengine-java?hl=en. -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.comgoogle-appengine-java%2bunsubscr...@googlegroups.com . For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en. -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
Re: [appengine-java] DateTime Comparison
Can you please try declare the date parameter and let the library help you pass it in? WHERE date :date query.setParameter(date, date); On Fri, May 7, 2010 at 12:19 PM, CodeMan chinu...@yahoo.com wrote: Hi, I am trying to fetch all records after a timestamp with this query select from com.chinua.Entity.Comment where date 'Sat Apr 17 21:40:05 UTC 2010' order by date desc The query just returns 0 records but there dates after Sat Apr 17. Can anyone help me out? Thanks CHINUA -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.comgoogle-appengine-java%2bunsubscr...@googlegroups.com . For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en. -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
Re: [appengine-java] [JDO Paging] Getting a cursor BEFORE the end of results
Thank you very much, Jeff. I'm so happy to learn those.
I will definitely try the suggested library.
Thanks.
On Sat, May 8, 2010 at 4:15 AM, Jeff Schnitzer j...@infohazard.org wrote:
This depends on what you mean by lazily load the entity. There are
at least three possible interpretations of lazy loading:
1) Lazily fetching data across the wire
2) Lazily converting from protocol buffers to Entity objects
3) Lazily translating Entity objects to Java POJOs
The first two steps are encapsulated within the Low-Level API, the
third step is part of JDO/Objectify/etc.
I know that when you issue a query, the results are batched in chunks
of a size that you can control. #1 and #2 are done together; the data
is pulled across the wire into materialized Entity objects in
increments of the batch size.
Objectify does #3 at the last possible moment; if you do not call
next() and retrieve a POJO entity, the POJO will not be instantiated.
You can call hasNext() to determine the existence of another page and
this will not create a POJO - however, the Low-Level API will create
the Entity.
In practice, it's hard to imagine that this matters unless your page
size is something like 2. If you have 20 elements on a page, the
worst-case scenario is that fetching 21 will add 5% to the cost of the
query. That's not much.
You can do what you want with Objectify and I suspect you can do what
you want with JDO, just don't use getResultList(). Get an actual
QueryResultIterator so the getCursor() call will return the correct
location.
Jeff
On Thu, May 6, 2010 at 8:48 PM, Chau Huynh cmhu...@gmail.com wrote:
Hi Jeff,
With JPA I will need to excute getResultList() to get a collection
http://java.sun.com/javaee/5/docs/api/javax/persistence/Query.html#getResultList()http://java.sun.com/javaee/5/docs/api/javax/persistence/Query.html#getResultList%28%29
Somehow org.datanucleus.store.appengine.query.getCursor(Iterator? iter)
can not get the cursor in the middle of my iterator, a null value is
returned in sample code below.
I guess getCursor() has something to do with the List returned.
EntityManager em =
Query query = em.createQuery(queryString);
query.setMaxResults(pageSize + 1);
em.getTransaction().begin();
IteratorTestEntity iterator = query.getResultList().iterator();
ListTestEntity list = new ArrayListTestEntity();
for (int i = 0; (i pageSize) iterator.hasNext(); i++) {
list.add(iterator.next());
}
Cursor cursor = JPACursorHelper.getCursor(iterator);
// assert iterator.hasNext() == true and cursor == null
em.getTransaction().rollback();
Just my curious:
if I'm able to iterate through the result (using
com.google.appengine.api.datastore.QueryResultIteratorT)
is it true that each iterator.hasNext() will lazily load entity from the
data store?
My concern is it might cost me more time that way than using
Query.getResultList(). Please advise.
Thank you.
On Fri, May 7, 2010 at 2:24 AM, Jeff Schnitzer j...@infohazard.org
wrote:
I'm a little confused by this. Why doesn't the OP's approach work?
1) Create query, fetch with limit of 21 items
2) Iterate through 20 items
3) Get cursor to be used for next page (if necessary)
4) Iterate to 21st item just to check for existence
Why won't this work? The documentation seems to imply that this is
how cursors work...
Jeff
On Thu, May 6, 2010 at 1:03 AM, Ikai L (Google) ika...@google.com
wrote:
This is a datastore limitation and not related to JDO/JPA, so you
won't
be
able to do this in Objectify either (you can look at the low-level
API,
it
doesn't provide this functionality). I believe I saw an issue in the
issues
tracker about creating cursors from arbitrary locations.
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Re: [appengine-java] DataNucleus JPA Lifecycle Callbacks
My entity classes were annotated, and work both in local and appspot. Thanks On Thu, May 6, 2010 at 4:02 PM, Simon qila...@gmail.com wrote: Has anyone managed to get the JPA lifecycle callbacks to work? I've annotated methods with @PrePersist and @PostLoad and the methods just never get called. I followed the documentation at http://www.datanucleus.org/products/accessplatform_2_0/jpa/lifecycle_callbacks.html just to make sure that my methods had the correct signatures. -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.comgoogle-appengine-java%2bunsubscr...@googlegroups.com . For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en. -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
Re: [appengine-java] Re: DataNucleus JPA Lifecycle Callbacks
Here you are ..
import java.io.Serializable;
import java.util.Calendar;
import java.util.Date;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.PostLoad;
import javax.persistence.PrePersist;
import javax.persistence.PreUpdate;
@Entity
public class LeaveItem implements Serializable {
private static final long serialVersionUID = 1L;
@Id
@GeneratedValue (strategy = GenerationType.IDENTITY)
private Long id;
private Date dateStart;
transient private int start;
transient private int end;
transient private int month;
transient private int year;
@SuppressWarnings(unused)
private int monthTag; // de-normalize
@SuppressWarnings(unused)
@PostLoad
private void postLoad() {
Calendar calendar = Calendar.getInstance();
calendar.setTime(dateStart);
start = calendar.get(Calendar.DAY_OF_MONTH);
month = calendar.get(Calendar.MONTH) + 1;
year = calendar.get(Calendar.YEAR);
}
@SuppressWarnings(unused)
@PrePersist
@PreUpdate
private void setMonthTag() {
this.monthTag = DateUtil.toIntTag(dateStart); // to QMM
}
}
On Thu, May 6, 2010 at 4:24 PM, Simon qila...@gmail.com wrote:
Well I'm confused then. I've annotated my class with @PostLoad,
@PrePersist and @PreUpdate.
The @PrePersist and @PreUpdate methods never get called, whether the
methods are located in the @Entity annotated class or in a defined
@EntityListeners annotated class. I've tried leaving the persistence
to the DN dirty-checking persistence and also by manually re-
persisting the entity using the EntityManager's persist method.
The @PostLoad method is only ever called if the entity is loaded via
the EntityManager's find method - if you retrieve a list of the
entities via a JPA defined query then the @PostLoad method just isn't
called.
To the couple of people who have this working, have you got some
example code/configuration you can share?
On May 6, 10:15 am, Chau Huynh cmhu...@gmail.com wrote:
My entity classes were annotated, and work both in local and appspot.
Thanks
On Thu, May 6, 2010 at 4:02 PM, Simon qila...@gmail.com wrote:
Has anyone managed to get the JPA lifecycle callbacks to work?
I've annotated methods with @PrePersist and @PostLoad and the methods
just never get called. I followed the documentation at
http://www.datanucleus.org/products/accessplatform_2_0/jpa/lifecycle_.
..
just to make sure that my methods had the correct signatures.
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Re: [appengine-java] Re: Is there any way that key name/id can be used in JPQL/JDQL?
Have you tried with KeyFactory? http://code.google.com/appengine/docs/java/javadoc/com/google/appengine/api/datastore/KeyFactory.html In this post Max Ross of Google guided how to query with Key, may it help you.. http://gae-java-persistence.blogspot.com/2010/01/querying-with-key-parameters.html On Thu, May 6, 2010 at 9:10 PM, Kenyth ken...@gmail.com wrote: I was partly wrong in the previous post, and finding what was wrong also leads me to the answer to the question asked in the previous post. Even using the encoded String key in conjunction with annotated gae.pk-name or gae.pk-id, it is still impossible to make a query with only the key name/id. Below is error messages when you try to do so: key name/id is a sub-component of the primary key. The datastore does not support filtering or sorting by primary key components, only the entire primary key You have to use the complete primary key to do the query, not part of it. So in this case you either make your key name/id the primary key or just use the Key instance as the primary key. It turns out using the encoded String key in conjunction with annotated gae.pk-name or gae.pk-id only provide you with shortcuts to access the key name/id, no other benefits. On May 6, 7:30 pm, Kenyth ken...@gmail.com wrote: Is there any way that key name (or pk-name), key id (or pk-id), or even parent key (or parent-key) can be used in a query regardless of JPQL or JDQL. I know in the Python edition it's possible (correct me if I'm wrong). If there's no way to use this kind query, then the power of key name or id (obviously from the GAE doc you can always benefit from a annotated parent key) would be very limited *except that you always use encoded string key in conjunction with annotated gae.pk-name or gae.pk-id*. // More to read if you would like to... From my limited experience with GAE/J, in a normal app key name/id is a very simple but powerful way to achieve uniqueness. For example, when you have multiple concurrent requests to create a root entity, in each request handler you would first check if it exists and then decide to create a new one or use the existing one. Without using key name/id it's very hard, if possible, to ensure the uniqueness. Because as far as I know in this case, the global unique key generated by the datastore is used to decide the transaction commit will succeed or fail. For the root entities, given the same entity kind and the same key name/id, the generated key instance will always be the same, so you can just let the transaction fail or try it again to rewrite it, but using other fields (say, name of a value) than key name/id, in all concurrent transactions a new entity will be created and the transaction commit will succeed since the generated key instance will always be different from each other. If in this case I would like to always use key name/id I roughly have three choices: 1. use Long key or unencoded String key for the entity kind, but the downside of this is you can't make this entity kind be child of any entity kind any more according to the official GAE doc; 2. use Key instance, but the downside is about this question asked in this post: you may use key name/id to make a query; 3. use encoded String key in conjunction with annotated gae.pk-name or gae.pk-id, and the only downside is you have always to use KeyFactory to convert the encoded string to a Key instance when you need one (e.g., to establish an unowned relationship) Last, what's described above seems also be true for entities with a parent. I'm not sure. -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.comgoogle-appengine-java%2bunsubscr...@googlegroups.com . For more options, visit this group athttp:// groups.google.com/group/google-appengine-java?hl=en. -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.comgoogle-appengine-java%2bunsubscr...@googlegroups.com . For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en. -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
Re: [appengine-java] [JDO Paging] Getting a cursor BEFORE the end of results
Hi Jeff,
With JPA I will need to excute getResultList() to get a collection
http://java.sun.com/javaee/5/docs/api/javax/persistence/Query.html#getResultList()
Somehow org.datanucleus.store.appengine.query.getCursor(Iterator? iter)
can not get the cursor in the middle of my iterator, a null value is
returned in sample code below.
I guess getCursor() has something to do with the List returned.
EntityManager em =
Query query = em.createQuery(queryString);
query.setMaxResults(pageSize + 1);
em.getTransaction().begin();
IteratorTestEntity iterator = query.getResultList().iterator();
ListTestEntity list = new ArrayListTestEntity();
for (int i = 0; (i pageSize) iterator.hasNext(); i++) {
list.add(iterator.next());
}
Cursor cursor = JPACursorHelper.getCursor(iterator);
// assert iterator.hasNext() == true and cursor == null
em.getTransaction().rollback();
Just my curious:
if I'm able to iterate through the result (using
com.google.appengine.api.datastore.QueryResultIteratorT)
is it true that each iterator.hasNext() will lazily load entity from the
data store?
My concern is it might cost me more time that way than using
Query.getResultList(). Please advise.
Thank you.
On Fri, May 7, 2010 at 2:24 AM, Jeff Schnitzer j...@infohazard.org wrote:
I'm a little confused by this. Why doesn't the OP's approach work?
1) Create query, fetch with limit of 21 items
2) Iterate through 20 items
3) Get cursor to be used for next page (if necessary)
4) Iterate to 21st item just to check for existence
Why won't this work? The documentation seems to imply that this is
how cursors work...
Jeff
On Thu, May 6, 2010 at 1:03 AM, Ikai L (Google) ika...@google.com wrote:
This is a datastore limitation and not related to JDO/JPA, so you won't
be
able to do this in Objectify either (you can look at the low-level API,
it
doesn't provide this functionality). I believe I saw an issue in the
issues
tracker about creating cursors from arbitrary locations.
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Re: [appengine-java] [JDO Paging] Getting a cursor BEFORE the end of results
There's 1 typo in my message, please read
org.datanucleus.store.appengine.query.CursorHelper.getCursor(Iterator?
iter)
Thanks
On Fri, May 7, 2010 at 10:48 AM, Chau Huynh cmhu...@gmail.com wrote:
Hi Jeff,
With JPA I will need to excute getResultList() to get a collection
http://java.sun.com/javaee/5/docs/api/javax/persistence/Query.html#getResultList()http://java.sun.com/javaee/5/docs/api/javax/persistence/Query.html#getResultList%28%29
Somehow org.datanucleus.store.appengine.query.getCursor(Iterator? iter)
can not get the cursor in the middle of my iterator, a null value is
returned in sample code below.
I guess getCursor() has something to do with the List returned.
EntityManager em =
Query query = em.createQuery(queryString);
query.setMaxResults(pageSize + 1);
em.getTransaction().begin();
IteratorTestEntity iterator = query.getResultList().iterator();
ListTestEntity list = new ArrayListTestEntity();
for (int i = 0; (i pageSize) iterator.hasNext(); i++) {
list.add(iterator.next());
}
Cursor cursor = JPACursorHelper.getCursor(iterator);
// assert iterator.hasNext() == true and cursor == null
em.getTransaction().rollback();
Just my curious:
if I'm able to iterate through the result (using
com.google.appengine.api.datastore.QueryResultIteratorT)
is it true that each iterator.hasNext() will lazily load entity from the
data store?
My concern is it might cost me more time that way than using
Query.getResultList(). Please advise.
Thank you.
On Fri, May 7, 2010 at 2:24 AM, Jeff Schnitzer j...@infohazard.orgwrote:
I'm a little confused by this. Why doesn't the OP's approach work?
1) Create query, fetch with limit of 21 items
2) Iterate through 20 items
3) Get cursor to be used for next page (if necessary)
4) Iterate to 21st item just to check for existence
Why won't this work? The documentation seems to imply that this is
how cursors work...
Jeff
On Thu, May 6, 2010 at 1:03 AM, Ikai L (Google) ika...@google.com
wrote:
This is a datastore limitation and not related to JDO/JPA, so you won't
be
able to do this in Objectify either (you can look at the low-level API,
it
doesn't provide this functionality). I believe I saw an issue in the
issues
tracker about creating cursors from arbitrary locations.
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[appengine-java] Versioning error using primitive int/Integer
Hello app engine team,
It seems to me there is an issue trying to persist a @Version int field.
System reports error ClassCassException from Long to Integer...
java.lang.ClassCastException: java.lang.Long cannot be cast to
java.lang.Integer
at test.TestEntity.jdoReplaceField(TestEntity.java)
at
org.datanucleus.state.JDOStateManagerImpl.replaceField(JDOStateManagerImpl.java:2687)
at
org.datanucleus.state.JDOStateManagerImpl.replaceField(JDOStateManagerImpl.java:2566)
at
org.datanucleus.store.appengine.DatastorePersistenceHandler.handleVersioningBeforeWrite(DatastorePersistenceHandler.java:415)
at
org.datanucleus.store.appengine.DatastorePersistenceHandler.insertPreProcess(DatastorePersistenceHandler.java:351)
at
org.datanucleus.store.appengine.DatastorePersistenceHandler.insertObjects(DatastorePersistenceHandler.java:251)
at
org.datanucleus.store.appengine.DatastorePersistenceHandler.insertObject(DatastorePersistenceHandler.java:240)
at
org.datanucleus.state.JDOStateManagerImpl.internalMakePersistent(JDOStateManagerImpl.java:3185)
at
org.datanucleus.state.JDOStateManagerImpl.flush(JDOStateManagerImpl.java:4513)
at
org.datanucleus.ObjectManagerImpl.flushInternal(ObjectManagerImpl.java:2814)
at org.datanucleus.ObjectManagerImpl.flush(ObjectManagerImpl.java:2754)
at
org.datanucleus.ObjectManagerImpl.preCommit(ObjectManagerImpl.java:2893)
at
org.datanucleus.TransactionImpl.internalPreCommit(TransactionImpl.java:369)
at org.datanucleus.TransactionImpl.commit(TransactionImpl.java:256)
at
org.datanucleus.jpa.EntityTransactionImpl.commit(EntityTransactionImpl.java:104)
at
org.datanucleus.store.appengine.jpa.DatastoreEntityTransactionImpl.commit(DatastoreEntityTransactionImpl.java:55)
at test.TestServlet.myInit(TestServlet.java:62)
at test.TestServlet.doGet(TestServlet.java:47)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:693)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:806)
at
org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)
at
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1166)
at
com.google.appengine.api.blobstore.dev.ServeBlobFilter.doFilter(ServeBlobFilter.java:51)
at
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at
com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:43)
at
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at
com.google.appengine.tools.development.StaticFileFilter.doFilter(StaticFileFilter.java:122)
at
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at
org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388)
at
org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
at
org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
at
org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418)
at
com.google.apphosting.utils.jetty.DevAppEngineWebAppContext.handle(DevAppEngineWebAppContext.java:70)
at
org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
at
com.google.appengine.tools.development.JettyContainerService$ApiProxyHandler.handle(JettyContainerService.java:349)
at
org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
at org.mortbay.jetty.Server.handle(Server.java:326)
at
org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
at
org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:923)
at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:547)
at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:212)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
at
org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:409)
at
org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582)
package test;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Version;
@Entity
public class TestEntity {
@Id
@GeneratedValue (strategy = GenerationType.IDENTITY)
private Long id;
@Version
private int version;
private String data;
public String getData() {
return data;
}
public void setData(String data) {
this.data = data;
}
}
TestEntity entity = new TestEntity();
entity.setData(test);
EntityManager em = EMF.get().createEntityManager();
EntityTransaction tx = em.getTransaction();
tx.begin();
em.persist(entity);
tx.commit();
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[appengine-java] Common Annotations - javax.annotation.PostConstruct
Hello,
Can anyone please advise how to get @PostConstruct invoked in App Engine
(SDK version 1.3.3.1)?
I tried with servlet and JPA/JDO but the conallback method was not
triggered.
Can you please take a look and let me know if I missed something? Thanks.
public class TestServlet extends HttpServlet {
Logger logger = Logger.getLogger(TestServlet.class.getName());
@PostConstruct
private void myPostConstructCallback () {
logger.warning(PostConstruct callback done);
}
...
}
@Entity
public class TestEntity {
@Id
private Long id;
private String value;
@PostConstruct
private void myPostConstructCallback () {
value = inited;
}
}
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Re: [appengine-java] Cursor support with JPA
Hi,
Cursor provides a point so that query will execute after that.
I don't think you can achieve the same thing with query.setFirstResult()
Below is code I ran based on consulting JDO example and JPA javadocs. Hope
this helps
EntityManager em = ...
Query query = em.createQuery(queryString);
query.setMaxResults(pageSize);
ListUser users = query.getResultList();
if (users.size() == pageSize) {
Cursor cursor = JPACursorHelper.getCursor(users);
if (cursor != null) {
String cursorString = cursor.toWebSafeString();
// store cursorString for later use
}
}
Query query = em.createQuery(queryString); // same query above
query.setMaxResults(pageSize);
Cursor cursor = Cursor.fromWebSafeString(cursorString);
if (cursor != null) {
query.setHint(JPACursorHelper.CURSOR_HINT, cursor);
}
ListUser users = query.getResultList();
...
On Thu, May 6, 2010 at 5:27 AM, fvisticot fvisti...@gmail.com wrote:
I do not see any documentation regarding cursor support with JPA.
Is the following code the correct way to use cursors ?
In this sample code, i will retrieve users from 300 to 320
(query.setMaxResults(20); query.setFirstResult(300);)
The test is OK with the Local Eclipse GAE plugin
@Test
public void getUsersCursorTest() {
EntityManagerFactory emf = null;
EntityManager em = null;
emf = AppEntityManagerFactory.get();
try {
em = emf.createEntityManager();
Query query = em.createNamedQuery(User.findAll);
query.setMaxResults(20);
query.setFirstResult(300);
ListUser users = query.getResultList();
_logger.info(UsersWithMax: + users.size());
for (User user: users) {
_logger.info(User: + user);
}
} finally {
if (em != null)
em.close();
}
}
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Re: [appengine-java] [JDO Paging] Getting a cursor BEFORE the end of results
About JDO/JPA, I tried the same thing, and Google advised to make 2 calls: the first one is your query, the second one, which is a key-only single item query so that it can be cheap, to check if more data is available. http://groups.google.com/group/google-appengine-java/browse_thread/thread/80f1a0314987f26b?pli=1 On Thu, May 6, 2010 at 12:18 AM, James jamesk...@gmail.com wrote: I'm implementing some UI paging and trying to detect whether a record exists beyond the current page (in order to show a more button). I hoped to iterate over a result set of pageSize + 1, grabbing the cursor as I pass the item @ pageSize, and then using the existence of the last item to know there's more to be shown. Unfortunately I can't find a way to accomplish this using JDO. JDOCursorHelper.getCursor(ListT) is documented to get the cursor for the last item in the list, so that works as documented but doesn't help me. JDOCursorHelper.getCursor(IteratorT) seems to be what I need, but every Iterator that I can find to pass to it causes it to return null. I've tried passing ((ListT)query.execute).iterator() as well as ((QueryResult)query.execute).iterator() and both have the same result. Anyone know if there's a not-too-kludgy way to do this w/o requerying the datastore for the additional item. Or is it easier in Objectify (I'm considering switching)? Thanks much, James -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.comgoogle-appengine-java%2bunsubscr...@googlegroups.com . For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en. -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
Re: [appengine-java] Datastore cursor return value question - CursorHelper.getCursor(List?)
Thank you Ikai On Fri, Apr 30, 2010 at 4:29 AM, Ikai L (Google) ika...@google.com wrote: You'll have to do another query since we don't peek ahead to see if you're at the end of the query result or not. You can optimize this, however, by doing a keys only query so you don't have to fetch the entities: http://code.google.com/appengine/docs/java/datastore/queriesandindexes.html#Queries_on_Keys On Wed, Apr 21, 2010 at 4:10 AM, Chau Huynh cmhu...@gmail.com wrote: Hello app engine team, I'd like to have a search form, which allows user to search next if more result available by using a Cursor. My issue is, in the last chunk, I am not able to detect if it's. Therefore, I will need to execute one additional query to test if more data. Can you please advise if other approach, without using the 2nd query. Thanks. By document, CursorHelper.getCursor(List?) will return a Cursor which points to the last element in the list. The code is below (correct according to doc) import com.google.appengine.api.datastore.Cursor; EntityManager em = ... Query query = em.createQuery(queryString); query.setMaxResults(20); em.getTransaction().begin(); ListTestEntity testEntities = query.getResultList(); Cursor cursor = JPACursorHelper.getCursor(testEntities); em.getTransaction().rollback(); Then I will need to invoke one more call later, to check a null cursor returned indicates no more data available query.setMaxResults(1); query.setHint(JPACursorHelper.CURSOR_HINT, cursor); em.getTransaction().begin(); ListTestEntity testEntities = query.getResultList(); Cursor cursor = JPACursorHelper.getCursor(testEntities); em.getTransaction().rollback(); By curiosity (please correct me if I'm wrong), I looked into org.datanucleus.store.appengine.query and found that StreamingQueryResult returned by DatastoreQuery, which was in fact constructed from com.google.appengine.api.datastore.QueryResultList. The document say return a cursor that points to the result immediately after the last one in this list. http://code.google.com/appengine/docs/java/javadoc/com/google/appengine/api/datastore/QueryResultList.html#getCursor()http://code.google.com/appengine/docs/java/javadoc/com/google/appengine/api/datastore/QueryResultList.html#getCursor%28%29 So I wonder if CursorHelper.getCursor(List?) can have something similar? Thank you. -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.comgoogle-appengine-java%2bunsubscr...@googlegroups.com . For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en. -- Ikai Lan Developer Relations, Google App Engine Twitter: http://twitter.com/ikai Delicious: http://delicious.com/ikailan Google App Engine links: Blog: http://googleappengine.blogspot.com Twitter: http://twitter.com/app_engine Reddit: http://www.reddit.com/r/appengine -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.comgoogle-appengine-java%2bunsubscr...@googlegroups.com . For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en. -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
Re: [appengine-java] Can you use cursors to go back?
You can find a more detailed discussion on this here http://groups.google.com/group/google-appengine-java/browse_thread/thread/da8b96441b0ae038/667aac2bb4109097?lnk=raot On Fri, Apr 30, 2010 at 1:17 AM, korey_sed kouro...@gmail.com wrote: I wonder if the java datastore API's cursor is a forward only cursor or not? if not, how do you go back? q.setExtend(-20,0) //to get the previous 20? -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.comgoogle-appengine-java%2bunsubscr...@googlegroups.com . For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en. -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
Re: [appengine-java] Data store Low-level API and filters
Maybe Query.addFilter() can help you? http://code.google.com/appengine/docs/java/javadoc/com/google/appengine/api/datastore/Query.html#addFilter%28java.lang.String,%20com.google.appengine.api.datastore.Query.FilterOperator,%20java.lang.Object%29 Just wonder if JPA/JDO can fit into your case: http://gae-java-persistence.blogspot.com/2009/10/executing-batch-gets.html The example use keys for batch get, but I think you can apply the same concept. On Fri, Apr 30, 2010 at 2:23 PM, dominity domin...@gmail.com wrote: Hi, guys. Can you tell me how could I add filter to query with OR operation? I.e., if I want to fetch all entities that have a field with certain value or with another one. Best regards, Alexander. -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.comgoogle-appengine-java%2bunsubscr...@googlegroups.com . For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en. -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
Re: [appengine-java] Re: Querying child objects based on parent key
I think korey_sed wanted to share knowledge base on his hand on experience,
his example should work...
The point in his example is querying with key, whether it's in child on
parent or child class
http://gae-java-persistence.blogspot.com/2010/01/querying-with-key-parameters.html
Obviously loading a patent class should work, but in case you have many
deleted Person, is it a waste (serialization)?
On Fri, Apr 30, 2010 at 8:14 PM, ailinykh ailin...@gmail.com wrote:
JDO is a thin layer which gives you some kind of automation and
restriction.
But it exists only an run time. I mean you have to instantiate objects
first. In other words
Company c = getCompany();
for(Person p:c.getPersons()){
if(p.isDeleted())
continue;
//do what ever you want to do
}
On Apr 29, 1:15 pm, korey_sed kouro...@gmail.com wrote:
I struggled with this for a while and could not find a clear example,
so I hope it helps someone out there.
I have a company object that has employees and employees could be
deleted (boolean property). So I wanted to search for all employees
for company X where the company is not deleted. It should be noted
that I have a bidrectional owned relationship setup between Company
and Person.
here is how I did it in JDO:
code
Key companyKey = KeyFactory.stringToKey(companyKeyString);
String queryStr = select from + Person.class.getName() +
where company == companyParam deleted ==
false;
Query q = pm.newQuery(queryStr);
q.declareVariables(Company.class.getName() + companyParam);
persons = (ListPerson)q.execute(companyKey);
/code
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Re: [appengine-java] Re: Data store Low-level API and filters
Hi, Query.addFilter() help to add filter, but not with OR operation as your need (sorry for my bad reading). http://gae-java-persistence.blogspot.com/2009/12/queries-with-and-in-filters.html This post explained that JPA/JDO (datanucleus-appengine) in fact break the query into multiple ones. If you go with low level API, then Tristan's suggestion should help in this case. (break the query and merge result instead let the library do it for you) Thanks. On Sat, May 1, 2010 at 3:11 AM, dominity domin...@gmail.com wrote: Thanx for reply. But, how do you propose to implement OR operation with Query#addFilter()? As I understand several filters are executed with AND operation. OR operation with JDO/JPA is trivial and I'm not interested in JDO/JPA implementation, thanx. Best regards, Alexander. -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.comgoogle-appengine-java%2bunsubscr...@googlegroups.com . For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en. -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
[google-appengine] Re: Mixed authenticated and unauthenticated content?
Please take a look into http://code.google.com/appengine/docs/java/config/webxml.html#Security_and_Authentication if it helps. Most often, the answer from the groups for custom authenticate / authorization (particular set of users in your post) is to build your own one. Thanks On Apr 30, 1:41 am, Craig Berry cdbe...@gmail.com wrote: ...Or to put my earlier question a different way, what's the right or easy way to accomplish that kind of part-public, part-login-protected design in GAE? On Thu, Apr 29, 2010 at 09:27, Craig Berry cdbe...@gmail.com wrote: I am building a GAE app which acts something like a CMS. Authenticated users in a particular set can manipulate content in the datastore, but anyone can see a page that is a read-only view of that data. I'd really like the latter page to be truly public, not requiring authentication to view. Is there a way to control the requirement for authentication by URL within a single app? I'm using Java, if that matters. -- Craig Berry -http://lapidum.org/home.html Magicians lie to the universe, and the universe believes them. -- Lenore Berry -- Craig Berry -http://lapidum.org/home.html Magicians lie to the universe, and the universe believes them. -- Lenore Berry -- You received this message because you are subscribed to the Google Groups Google App Engine group. To post to this group, send email to google-appeng...@googlegroups.com. To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com. For more options, visit this group athttp://groups.google.com/group/google-appengine?hl=en. -- You received this message because you are subscribed to the Google Groups Google App Engine group. To post to this group, send email to google-appeng...@googlegroups.com. To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en.
Re: [appengine-java] Re: about count query
Thanks for the info. I can see count and tried it. Thank you. As a side note, I have a look into org.datanucleus.store.appengine.query.DatastoreQuery In case of count, it's a call to com.google.appengine.api.datastore.PreparedQuery.countEntities() Key only query still need to go through some wrapping/serialization though. So it seems to me the former is more efficient (currently not support with limit/offset though). On Wed, Apr 28, 2010 at 2:41 PM, Joe Fawzy joewic...@gmail.com wrote: it is supported ,use it u can find several posts about it in this group joe On Apr 28, 4:47 am, Chau Huynh cmhu...@gmail.com wrote: On Wed, Apr 28, 2010 at 5:24 AM, Joe Fawzy joewic...@gmail.com wrote: select count (this) from User Since when app engine support group operation? ;-) On Wed, Apr 28, 2010 at 5:24 AM, Joe Fawzy joewic...@gmail.com wrote: Hi all i am using JDO and i want to count the number of entities so which is more efficient using a count quert, eg: select count (this) from User or key only query select id from User then get the count using resultList.size(); by the way , i know that the recommended way on appengine is to precompute but this cannot be done in my case thanks Joe -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.comgoogle-appengine-java%2bunsubscr...@googlegroups.comgoogle-appengine-java%2B unsubscr...@googlegroups.com . For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en. -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.comgoogle-appengine-java%2bunsubscr...@googlegroups.com . For more options, visit this group athttp:// groups.google.com/group/google-appengine-java?hl=en. -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.comgoogle-appengine-java%2bunsubscr...@googlegroups.com . For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en. -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
Re: [appengine-java] Re: Manually restart GAE on the cloud
In fact, the post owner already uploaded new version but it did not work for him. So he wanted to ask for any deploy suggestion, maybe lucky enough on case basis. On Thu, Apr 29, 2010 at 2:54 AM, Duong BaTien duong.bat...@gmail.comwrote: We increase the version number, load it up, test it, then change to the new version, delete the old one. BaTien DBGROUPS and BudhNet On Wed, 2010-04-28 at 11:15 +0700, Chau Huynh wrote: Delete the version and redeploy, maybe? Or should Google hep you look into your case, as App Engine user do not have such direct control on their system to reboot. On Wed, Apr 28, 2010 at 10:54 AM, Phuong Nguyen phuongn...@gmail.com wrote: I think disable/enable your app doesnot reboot JVM. I'm trying FreeMarker. If JVM process a class for the first time, then VerifyError is thrown. On second time, it throw NoClassDefFoundError. When I disabled and reenabled, JVM still throws NoClassDefFoundError. So I guess JVM is not restarted. On Apr 28, 10:00 am, Thomas mylee...@gmail.com wrote: In the Admin Console you can disable your application and re-enable it. I think it is much like a JVM reboot. -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine- j...@googlegroups.com. To unsubscribe from this group, send email to google- appengine-java+unsubscr...@googlegroups.comappengine-java%2bunsubscr...@googlegroups.com . For more options, visit this group athttp://groups.google.com/group/google-appengine-java?hl=en. -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine- j...@googlegroups.com. To unsubscribe from this group, send email to google- appengine-java+unsubscr...@googlegroups.comappengine-java%2bunsubscr...@googlegroups.com . For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en. -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine- j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java +unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en. -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.comgoogle-appengine-java%2bunsubscr...@googlegroups.com . For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en. -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
Re: [appengine-java] What happens when I don't close persistenceManagers?
Hi Jaroslav,
I think the Article entity returned was detached already, right?
In fact you can try a simple test by modifying the returned object and
verify it value on Admin Console.
The PersistenceManagerFactory takes time to init, but once only (
http://code.google.com/appengine/docs/java/gettingstarted/usingdatastore.html
)
while it's cheap to create as many PersistenceManager's as your need.
Thanks
2010/4/29 Jaroslav Záruba jaroslav.zar...@gmail.com
What are possible consequences of having method like this?
--
public Article getArticle(Key key)
{
return
pManagerFactory.getPersistenceManager().getObjectById(Article.class,
key);
}
--
Is it generally wrong? I.e. will I run out of available pManagers?
And if it is OK, for how long can I call setters on non-detached
object to have those changes propagated to data-store?
Regards
J. Záruba
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Re: [appengine-java] Specifying a date filter in a query
http://www.datanucleus.org/products/accessplatform_2_0/jdo/jdoql.htmlExample 3 is the right answer for you. It might be better if you could go through document to have an understanding on its concepts first. Thanks. On Wed, Apr 28, 2010 at 1:36 AM, Vinay vinaytand...@gmail.com wrote: Hi, I am new to Java and App engine. I am trying to query data that has been written to the datastore using JDO. I am getting an exception when I try to filter on a Date property: Query query = pm.newQuery(DataPoint.class); query.setFilter( m_tradeDateTime DATETIME(2010, 10,1, 0, 0,0)); ListDataPoint dp = (ListDataPoint)query.execute(); m_tradeDateTime is of type Date. DATE or DATETIME fails when the query is parsed. What is the right way of specifying a date value in a filter? Filtering on a string property works correctly, not sure what is the expected format for specifying a value for a Date type property. Thanks, -Vinay -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.comgoogle-appengine-java%2bunsubscr...@googlegroups.com . For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en. -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
Re: [appengine-java] about count query
On Wed, Apr 28, 2010 at 5:24 AM, Joe Fawzy joewic...@gmail.com wrote: select count (this) from User Since when app engine support group operation? ;-) On Wed, Apr 28, 2010 at 5:24 AM, Joe Fawzy joewic...@gmail.com wrote: Hi all i am using JDO and i want to count the number of entities so which is more efficient using a count quert, eg: select count (this) from User or key only query select id from User then get the count using resultList.size(); by the way , i know that the recommended way on appengine is to precompute but this cannot be done in my case thanks Joe -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.comgoogle-appengine-java%2bunsubscr...@googlegroups.com . For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en. -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
Re: [appengine-java] Re: Manually restart GAE on the cloud
Delete the version and redeploy, maybe? Or should Google hep you look into your case, as App Engine user do not have such direct control on their system to reboot. On Wed, Apr 28, 2010 at 10:54 AM, Phuong Nguyen phuongn...@gmail.comwrote: I think disable/enable your app doesnot reboot JVM. I'm trying FreeMarker. If JVM process a class for the first time, then VerifyError is thrown. On second time, it throw NoClassDefFoundError. When I disabled and reenabled, JVM still throws NoClassDefFoundError. So I guess JVM is not restarted. On Apr 28, 10:00 am, Thomas mylee...@gmail.com wrote: In the Admin Console you can disable your application and re-enable it. I think it is much like a JVM reboot. -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.comgoogle-appengine-java%2bunsubscr...@googlegroups.com . For more options, visit this group athttp:// groups.google.com/group/google-appengine-java?hl=en. -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.comgoogle-appengine-java%2bunsubscr...@googlegroups.com . For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en. -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
Re: [appengine-java] Handling concurrent modification
Maybe you can look into low level API to obtain a lock http://code.google.com/appengine/docs/java/javadoc/com/google/appengine/api/memcache/MemcacheService.html#increment%28java.lang.Object,%20long%29 There're also sample implementation using this posted in the group https://groups.google.com/group/google-appengine/browse_thread/thread/253b9f79f0c178d9/0188ee19a3460ec4?#0188ee19a3460ec4 On Fri, Apr 23, 2010 at 11:23 AM, Phuong Nguyen phuongn...@gmail.comwrote: Hi guys: I'm creating an app that I need to deal with concurrent modification of object. Given I have an object that I need to store on memcache. Now, given my user base would be big enough for two request to arrive simultaneously at two different servers in the cloud. So, in order to modify the object, the server #1 that receive request fetch the object from memcache (Correct me if I'm wrong: this will deserialized raw data on memcache in to Java Object on Server #1 JVM), modify it and then put it back to memcache (which in turn serialize the object). At the same time, server #2 tried to modify the object on memcache. Under this scenario: Server #1 fetch object Server #2 fetch object Server #1 store object Server #2 store object Then all changes make by Server #1 will be overrided by Server #2. If these 2 requests happen on the same Server (and in effect, the same JVM), then I believe the use of synchronized access will help. But in case they happen on different server, then I don't know how to handle them yet. Would you guys advice me on that? Thanks. -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.comgoogle-appengine-java%2bunsubscr...@googlegroups.com . For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en. -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
[appengine-java] Datastore cursor return value question - CursorHelper.getCursor(List?)
Hello app engine team, I'd like to have a search form, which allows user to search next if more result available by using a Cursor. My issue is, in the last chunk, I am not able to detect if it's. Therefore, I will need to execute one additional query to test if more data. Can you please advise if other approach, without using the 2nd query. Thanks. By document, CursorHelper.getCursor(List?) will return a Cursor which points to the last element in the list. The code is below (correct according to doc) import com.google.appengine.api.datastore.Cursor; EntityManager em = ... Query query = em.createQuery(queryString); query.setMaxResults(20); em.getTransaction().begin(); ListTestEntity testEntities = query.getResultList(); Cursor cursor = JPACursorHelper.getCursor(testEntities); em.getTransaction().rollback(); Then I will need to invoke one more call later, to check a null cursor returned indicates no more data available query.setMaxResults(1); query.setHint(JPACursorHelper.CURSOR_HINT, cursor); em.getTransaction().begin(); ListTestEntity testEntities = query.getResultList(); Cursor cursor = JPACursorHelper.getCursor(testEntities); em.getTransaction().rollback(); By curiosity (please correct me if I'm wrong), I looked into org.datanucleus.store.appengine.query and found that StreamingQueryResult returned by DatastoreQuery, which was in fact constructed from com.google.appengine.api.datastore.QueryResultList. The document say return a cursor that points to the result immediately after the last one in this list. http://code.google.com/appengine/docs/java/javadoc/com/google/appengine/api/datastore/QueryResultList.html#getCursor() So I wonder if CursorHelper.getCursor(List?) can have something similar? Thank you. -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
Re: [appengine-java] Re: One - Many Child Persistence help
On Tue, Apr 20, 2010 at 5:48 PM, DeliveryNinja noble1...@googlemail.comwrote: It seems that having any data in the ListComment comments in the Content.java causes the serialization error. Even when I've removed all the data from the Serializable class Comment.java. So it has nothing but a constructor. In this post, Max Ross of Google explained on serialized fields and wrapper of List. Maybe his advise can help you http://groups.google.com/group/google-appengine-java/browse_thread/thread/747ceed8396c0ed8/10ccdd1a0c376825 -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
Re: [appengine-java] Google App Engine for Java app couldn’t find javac ?
Please try verification step in Getting Java session from the tutorial
http://code.google.com/appengine/docs/java/gettingstarted/installing.html
java -version
javac -version
If error, it's likely you need to add {JAVA_HOME}\bin to Path variable.
Typically you might need to remove bin out of your JAVA_HOME setting C:
\Program Files (x86)\Java\jdk1.6.0_18\bin.
Thanks.
On Wed, Apr 21, 2010 at 3:56 AM, fni min...@gmail.com wrote:
I'm learning to use Google App Engine, I installed it in Netbeans, the
project works, but when I clicked on Deploy To Google App Engine, I
got the following error :
Beginning server interaction for ...
0% Creating staging directory
5% Scanning for jsp files.
8% Compiling jsp files.
11% Compiling java files.
Error Details:
Apr 20, 2010 3:51:23 PM org.apache.jasper.JspC processFile
INFO: Built File: \PayPal_Monitor.jsp
java.lang.IllegalStateException: cannot find javac executable based on
java.home, tried C:\Program Files (x86)\Java\jre6\bin\javac.exe and
C:\Program Files (x86)\Java\bin\javac.exe
Unable to update app: cannot find javac executable based on java.home,
tried C:\Program Files (x86)\Java\jre6\bin\javac.exe and C:\Program
Files (x86)\Java\bin\javac.exe
Please see the logs [C:\Users\NM\AppData\Local\Temp
\appcfg3946701335172983337.log] for further information.
The file javac.exe is in : C:\Program Files (x86)\Java
\jdk1.6.0_18\bin
How can I add it to java.home ? I'm using Win Vista, and I tried to
add it from System - Environment Variables, but there is no
java.home in there. So I added JAVA_HOME to it pointing to : C:
\Program Files (x86)\Java\jdk1.6.0_18\bin
But it still gives me the same error. I wonder where this java.home
is, and how to change it ?
Frank
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Re: [appengine-java] Re: HTTP ERROR 405 with Guestbook Tutorial
On Sat, Apr 17, 2010 at 8:43 AM, bosun david.bo...@gmail.com wrote:
Is there a order requirement in servlet/ element? Or should only one
servlet defined in this section? Anyone know how does invocation make on
servlets in section of servlet/ and servlet-mapping/ in web.xml ? Does
invocation go through chains of servlet?
It's because of incorrect servlet and servlet-mapping declaration in
your old web.xml.
Should use each servlet to define 1 servlet only (no limit on numer of
servlet)
The link in web.xml file reference to those syntax
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd
or you can just google web.xml for easier explanation.
On Sat, Apr 17, 2010 at 8:43 AM, bosun david.bo...@gmail.com wrote:
From my observation, form action=/sign method=post in guestbook.jsp
is expected to trigger doPost method in SignGuestBookServlet but instead, it
invoks doGet method in GuestbookServlet as it's the first servlet defined in
web.xml. Thus, it causes the error message like HTTP method POST is not
supported by this URL.
I have been working on this issue for hours and finally I made it worked
but I have to delete the servlet guestbook from entries in servlet/ and
servlet-mapping/ in web.xml. But in tutorial, it didn't mention the
deletion. It also works if I moved up the servlet sign to the first entry.
I don't understand why it behaves like this. It looks to me that doGet
method in GuestbookServet other than doPost method in SignGuestbookServlet
gets invoked immediately after a user clicks Post Greetings, which posts
data in the form. Is there a order requirement in servlet/ element? Or
should only one servlet defined in this section? Anyone know how does
invocation make on servlets in section of servlet/ and servlet-mapping/
in web.xml ? Does invocation go through chains of servlet?
After deletion, web.xml now looks like below:
?xml version=1.0 encoding=utf-8?
web-app xmlns:xsi=http://www.w3.org/2001/XMLSchema-instance;
xmlns=http://java.sun.com/xml/ns/javaee;
xmlns:web=http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd;
xsi:schemaLocation=http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd; version=2.5
servlet
servlet-namesign/servlet-name
servlet-classguestbook.SignGuestbookServlet/servlet-class
/servlet
servlet-mapping
servlet-namesign/servlet-name
url-pattern/sign/url-pattern
/servlet-mapping
welcome-file-list
welcome-fileguestbook.jsp/welcome-file
/welcome-file-list
/web-app
On Fri, Apr 16, 2010 at 12:42 PM, bosun david.bo...@gmail.com wrote:
Hi Chau,
I used the code in the tutorial with a slightly change. Data is posted by
POST method in the form so SignGuestbookServlet should use doPost to handle
it.
Anothe thing I am confused is that I can't see log message in Eclipse
console if I added custom message like log.info or system.out.printlin
alough I givie guestbook.level = INFO in logging.properties.
Code below is SignGuestbookServlet.java:
import com.google.appengine.api.users.UserService;
import com.google.appengine.api.users.UserServiceFactory;
public class SignGuestbookServlet {
private static final Logger log =
Logger.getLogger(SignGuestbookServlet.class.getName());
public void doPost(HttpServletRequest req, HttpServletResponse resp)
throws IOException {
UserService userService = UserServiceFactory.getUserService();
User user = userService.getCurrentUser();
String content = req.getParameter(content);
if (content == null) {
content = (No greeting);
}
if (user != null) {
log.info(Greeting posted by user + user.getNickname() + :
+ content);
} else {
log.info(Greeting posted anonymously: + content);
}
resp.sendRedirect(/guestbook.jsp);
}
}
Code below is guestbook.jsp:
%@ page contentType=text/html;charset=UTF-8 language=java %
%@ page import=com.google.appengine.api.users.User %
%@ page import=com.google.appengine.api.users.UserService %
%@ page import=com.google.appengine.api.users.UserServiceFactory %
html
body
%
UserService userService = UserServiceFactory.getUserService();
User user = userService.getCurrentUser();
if (user != null) {
%
pHi, %= user.getNickname() %! (You can
a href=%= userService.createLogoutURL(request.getRequestURI()) %sign
out/a.)/p
%
} else {
%
pHello!
a href=%= userService.createLoginURL(request.getRequestURI()) %Sign
in/a
to include your name with greetings you post./p
%
}
%
Comment Board:
form action=/sign method=post
divtextarea name=content rows=3 cols=60/textarea/div
divinput type=submit value=Post Greeting //div
/form
/body
/html
code below is GuestbookServlet.java:
package guestbook;
import java.io.IOException;
import javax.servlet.http.*;
import com.google.appengine.api.users.User;
import com.google.appengine.api.users.UserService;
import
[appengine-java] Deployment Descriptor Filters: typo in example
Hello, It looks like a typo in http://code.google.com/appengine/docs/java/config/webxml.html#Filters Code: filterConfig.doFilter(request, response); Also sample LogFilterImpl does not implement all methods defined in javax. servlet.Filter Can you please take a look and update. Thanks -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
Re: [appengine-java] Re: Objectify - Twig - SimpleDS articles
First of all, please accept big thanks, Andreas. Those knowledge sharing is helpful to me as well as other learners. Follow the thread, I think I was a bit misled on benefit of SQL/JDBC on GAE. In Andreas blog's, he mentioned on learning curve to deal with the mapping: Java classess -- JDO/JPA - implementation specific to datastore - Datastore That's why he looked for low-level wrapper frameworks. (do read his post first) Surprisingly, there're even suggestion to him: Java classes -- JPA -- Hibernate implementation -- 3rd party implementation (JDBC/SQL) -- Datastore Data models formally define data elements and relationships among data elements for a domain of interest. Yes, 100% agree. So, it is honestly speaking that data model has nothing to do with technology? What about is the big mismatch between model and physical storage? and purpose of object-relational mapping tool? More mappings and less mismatch? Reading Google GAE docs, forum, blog, as well as other non-Google site ( stackoverflow.com, highscalability.com ..) the stress is, datastore is not relational DB. What a coincidence! On Tue, Mar 30, 2010 at 10:47 PM, Sandeep Sathaye sandeep.sath...@gmail.com wrote: Hi Guillermo, I agree with you completely. Here are my thoughts on the subject. Relational theory, SQL and JDBC are functional specifications and RDBMS vendors implement these specifications. Actually speaking data model has nothing to do with technology. A data model in software engineering is an abstract model that describes how data is represented and accessed. Data models formally define data elements and relationships among data elements for a domain of interest. The tools which extrapolate proper strategy for storing and accessing data on the underlying datastore based on the data model and expose it via SQL and JDBC in both client/server and server mode have a great advandage. This is our goal at Cloud2db. This abstraction layer also gives you complete flexibility of choosing your underlying datastore. For example, we are about to release Cloud2db Amazon SimpleDB and Hadoop Hbase implementations soon. Thanks, Sandeep. On Tue, Mar 30, 2010 at 11:03 AM, Guillermo Schwarz guillermo.schw...@gmail.com wrote: Andreas, I think there is more misunderstanding again. SQL can be run on top of a file system (fseek, read, write) or on top of a persistent hashmap (datastore). If you create a SQL interface on top of any of those, then it is a relational database, not a fake but a real relational database. Why would I want a relational database? Consistency, for starters. ACID transactions. Set operations. Read: 1. http://www.buzzle.com/articles/advantages-of-relational-databases.html 2. http://www.sunadal.co.uk/db.php 3. http://www.euclideanspace.com/software/information/relational/index.htm Working directly with aseembly code and bits may be what you prefer, but if history is correct, computer science is about building abstractions. Good abstractions. I agree that you can create the wrong tools for the job, but that doesn't stop other people to investigate and innovate to create better tools (better abstractions). BTW: You dont need to use JDBC directly when working with CloudDB or jiql. You can always select Hibernate, JDO or even JPA. The advantage of using an extra level of abstraction is that if later the DataStore changes or there is a new alternative to the DataStore that is faster (but has a new API) all you need to do is to reimplement SQL on top of it and voila: All your applications have been ported effortlessly. That's the whole point of using abstraction layers. Cheers, Guillermo. On Tue, Mar 30, 2010 at 10:49 AM, Andreas Borglin andreas.borg...@gmail.com wrote: Ok, you seem to misunderstand me quite a bit here. I never said it can't be used. I just said that I don't want to. Other than for portability reasons, why would I want to pretend that the datastore is relational by using a framework that emulates this? My main requirement, which was formed after using j...@gae, is that I want to use a framework that has a natural mapping to the datastore. I'm not saying that there is anything wrong with JDO/JPA, cloud2db or jiql in general. I'm just saying that, for me, it makes more sense to use a framework that exposes the true nature of the datastore (which is very different from a relational database), instead of hiding it under a portable abstraction layer. Simplicity and performance is more important than portability for me. That is of course not true for many other projects, so I'm only speaking from my perspective. If you can argue that jiql (or any other multi-platform framework like cloud2db, etc) can provide a natural mapping to the datastore AND be as efficient as the low-level wrappers, I'm all ears. j...@gae didn't do it for me at least. I never said that GWT had anything to do with SQL. I just don't want to use JDBC. On Mar 30,
Re: [appengine-java] Adding, updating and deleting fields in app engine's datastore
You might want to use wrapper class (Long instead of long) to add new field to load existing data. To remove a property, you will need to update your Java class first, right? Later retrieval of an instance, the field is not get loaded, then you save/persist and the field is gone. About changing property name, my thought is why do you want to challenge yourself on such matter? Why don't you just remove and add a new field? http://code.google.com/appengine/articles/datastore/overview.html In this series of articles explains what is behind your object, so it's not just your entity/class only, there're indexes as well. Reading the Google IO session, JDO/JPA is explained as the standard interface to access GAE service. Just in case you want to move your app out of GAE, you can still use the those. You might want to read other alternatives also; Twig, Objectify recently announced very cool features released... Thanks. On Sat, Mar 27, 2010 at 4:11 AM, jbdhl jbirksd...@gmail.com wrote: I got an answer to the below questions in this thread: http://groups.google.com/group/google-appengine/browse_thread/thread/dc2dcf2e71bc1055 but was recommended to ask here also. Here goes... I try to figure out how easy it is to ruin/break the data in app engine's datastore by accident (using JDO). Assume that a class, say MyClass, has a number of persistent members, e.g. ... int a int b int c ... and assume a number of MyClass objects have been stored in app engine's persistent storage. Now, what will happen if... 1) a new persistent member variable, int d, is *added* to MyClass? The old objects in datastore did not have this variable, so what will their d-value be when they are fetched from datastore? 2) a persistent member variable, int b, is *removed* from MyClass? I guess the b field will be removed from all stored MyClass objects? If not, what will happen if b is re-added at some later point in time? Will the stored MyClass objects now get their old b-value back? 3) the type of a persistent member variable is changed, e.g. if a is converted to a String? What will the value of a be when the already stored objects are fetched from datastore? By the way: the app engine docs focuses on JDO as the interface to the datastore. Is JDO particularly superior to the alternatives? (JPA, Objectify, Twig, SimpleDS, Slim3) -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.comgoogle-appengine-java%2bunsubscr...@googlegroups.com . For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en. -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
Re: [appengine-java] Re: how to build same entity group
As a non native English speaker also, let me guess If I got you correctly,
dreamy
You want to manipulate Telephone separately, independent of its-owner-to-be,
so you will have a Telephone class.
Similarly, you will have another class for Person.
Because there're no dependency between creating of Person and Telephone, you
will not need to put those in the same transaction (entity group, you thread
subject was a bit confused) - just check Ikai's explanation above.
Now your need to represent when user buys/exchanges some phones? Can you try
this:
class Person {
ListKey phones;
}
You might need to read relationship link above for more detail.
Thanks
On Thu, Mar 25, 2010 at 7:24 PM, dreamy dreamy2c...@gmail.com wrote:
for instance, you can just use a Key and reference
the Person in the Telephone.
you are right. and i just do it as you say.
public class Telephone{
@PrimaryKey
@Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
@Extension(vendorName=datanucleus, key=gae.encoded-pk,
value=true)
private String telephone_id;
@Persistent
private String person_id; //this field point to Person
}
my question is
if person have telephone( telephone1,telephone2,telephone3) and user
update person's telephone is telephone2,telephone3,telephone4,how
to implements this?
but in a same transactions , I need update 2 telephone
object .--telephone1.person_id=null
telephone4.person_id=person_id.
and the 2 telephone object is not in same entity group.
the question seem to equalhow to update multi object (same
class) in same transaction?
Thank you for your help
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[google-appengine] Re: questions on datastore (lowercase comparison / one character String )
It seems to be issue querying with Key param Please check another article from Max and see if it help: http://gae-java-persistence.blogspot.com/2010/01/querying-with-key-parameters.html On Mar 23, 1:47 pm, vchalmel groupeprojeten...@gmail.com wrote: Ok Thanks your advices solved my problem with lowercase Comparison. I still faces issues with these one-character Strings problem, do you know why, when i try to compare a String Attribute in Datastore to a one-character String, it throws this java.lang.Character cannot be cast to com.google.appengine.api.datastore.Key exception ? -- You received this message because you are subscribed to the Google Groups Google App Engine group. To post to this group, send email to google-appeng...@googlegroups.com. To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en.
[google-appengine] Re: questions on datastore (lowercase comparison / one character String )
You can save storage by just quote Max Ross's article...
http://gae-java-persistence.blogspot.com/2009/11/case-insensitive-queries.html
On Mar 23, 12:27 am, Gleidson - MG - Brasil
gleidson.gmo...@gmail.com wrote:
If you're using a relational database it's pretty easy to execute case-
insensitive queries because it's a native feature of the database. It
usually looks something like this:
select * from Person where UPPER(lastName) = 'ROSS'
This is a challenge for the App Engine Datastore because we rely on
executing scans over a limited subset of your data and returning
results as we encounter them. Consider the following strings in
lexicographic order:
...
ROSE
...
ROSS
...
ROSTA
...
Rose
...
Ross
...
Rosta
...
rose
...
ross
...
rosta
...
As you can see there could be an unlimited number of rows in between
'ROSS' and 'Ross', and also between 'Ross' and 'ross' (okay not
unlimited, we do have a limit on indexed string length, but definitely
Large), so if we start scanning at 'ROSS' we might have to skip a huge
number of results before we hit 'Ross', and that doesn't scale. This
is why the datastore doesn't support case-insensitive queries.
Fortunately it's not hard to implement support for case-insensitive
queries in your application. Here's the approach: for each field that
you want to query in a case-insensitive way, create a duplicate field
that stores the value of that field in either all upper or lowercase
letters. Then, have your model object register a pre-persist callback
with your persistence framework (JPA or JDO), and then populate the
duplicate fields inside that callback. Here's what it looks like.
JPA:
import javax.persistence.PrePersist;
import javax.persistence.PreUpdate;
@Entity
public class Person {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
private String lastName;
private String uppercaseLastName;
public Long getId() {
return id;
}
public String getLastName() {
return lastName;
}
public void setLastName(String lastName) {
this.lastName = lastName;
}
@PrePersist
@PreUpdate
public void prePersist() {
if (lastName != null) {
uppercaseLastName = lastName.toUpperCase();
} else {
uppercaseLastName = null;
}
}
}
public ListPerson getPeopleByLastName(String lastName) {
Query q = em.createQuery(select from Person where uppercaseLastName
= :p);
q.setParameter(p, lastName.toUpperCase());
return (ListPerson) q.getResultList();
}
JDO:
import javax.jdo.listener.StoreCallback;
@PersistenceCapable(identityType = IdentityType.APPLICATION)
public class Person implements StoreCallback {
@PrimaryKey
@Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
private Long id;
private String lastName;
private String uppercaseLastName;
public Long getId() {
return id;
}
public String getLastName() {
return lastName;
}
public void setLastName(String lastName) {
this.lastName = lastName;
}
public void jdoPreStore() {
if (lastName != null) {
uppercaseLastName = lastName.toUpperCase();
} else {
uppercaseLastName = null;
}
}
}
public ListPerson getPeopleByLastName(String lastName) {
Query q = pm.newQuery(Person.class, uppercaseLastName == :p);
return (ListPerson) q.execute(lastName.toUpperCase());
}
On 21 mar, 17:41, vchalmel groupeprojeten...@gmail.com wrote:
Hi !
I wonder how to compare a String stored in a datastore entity (field
login) to an entry (also named login) considering their lowercase
version :
- I tried : SELECT count(this) FROM +Gestionnaire.class.getName()+
WHERE LowerCase(login)== LowerCase('+login+') which throws an
exception
I have another problem with this query, I don't want to exclude the
one-character login like, maybe 1, but this also fires an exception
( java.lang.Character cannot be cast to
com.google.appengine.api.datastore.Key )
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Re: [appengine-java] Re: Discussion on will-it-play-in-app-engine
Hi, I looked in archive link (http://archive.apache.org/dist/struts/binaries/) and I could not find the version 1.2.28 as Google document, might be 1.2.8? (How embarrassed I did not read your message appropriately). On Tue, Mar 16, 2010 at 8:26 PM, eldandi matias.burch...@gmail.com wrote: thank you Chau for your fast reply, but I already looked in there, and the mentioned version (1.2.28) doesn't exist in the struts official web page or any known public maven2 repository, that is why I raised my question here. Any help would be appreciated. I also thought that maybe the version was wrong, and maybe it just needs a correction on the version number. thanks in advance! On Mar 15, 11:54 pm, Chau Huynh cmhu...@gmail.com wrote: Hi, The struts binaries can be found on Struts download page: http://struts.apache.org/download.cgi Although it's quite a bit difficult to find on Struts 1 page...On Tue, Mar 16, 2010 at 4:28 AM, eldandi matias.burch...@gmail.com wrote: Hi, I was wondering if someone could please add a link to the download page of the struts 1.2.28 version, as I find it very hard to find and I see that most of the other supported frameworks have their own links. Thanks! -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.comgoogle-appengine-java%2bunsubscr...@googlegroups.comgoogle-appengine-java%2B unsubscr...@googlegroups.com . For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en. -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.comgoogle-appengine-java%2bunsubscr...@googlegroups.com . For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en. -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
Re: [appengine-java] FinalizableReferenceQueue
Quote: You can ignore it. It's a red herring http://tinyurl.com/y8tlejthttp://www.google.com/url?sa=Dq=http://tinyurl.com/y8tlejtusg=AFQjCNFIMnUbbdgwZwSca1czKxGrbQFz8Q. ( https://groups.google.com/group/google-appengine-java/browse_thread/thread/9d019bda2070e382 ) On Thu, Mar 4, 2010 at 12:04 AM, dominity domin...@gmail.com wrote: Hi, guys. Some times I can see I the log something like that: # I 03-03 09:00AM 17.033 com.google.appengine.repackaged.com.google.common.base.FinalizableReferenceQueue $SystemLoader loadFinalizer: Not allowed to access system class loader. # I 03-03 09:00AM 17.050 com.google.appengine.repackaged.com.google.common.base.internal.Finalizer getInheritableThreadLocalsField: Couldn't access Thread.inheritableThreadLocals. Reference finalizer threads will inherit thread local values. # I 03-03 09:00AM 17.053 com.google.appengine.repackaged.com.google.common.base.FinalizableReferenceQueue init: Failed to start reference finalizer thread. Reference cleanup will only occur when new references are created. java.lang.reflect.InvocationTargetException at com.google.appengine.runtime.Request.process-82241ba22a815a34(Request.java) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Method.java:43) at com.google.appengine.repackaged.com.google.common.base.FinalizableReferenceQueue.init(FinalizableReferenceQueue.java: 127) at com.google.appengine.repackaged.com.google.common.collect.Interners $WeakInterner.clinit(Interners.java:118) at com.google.appengine.repackaged.com.google.common.collect.Interners.newWeakInterner(Interners.java: 59) at com.google.appengine.repackaged.com.google.io.protocol.ProtocolSupport.clinit(ProtocolSupport.java: 55) at com.google.apphosting.api.DatastorePb $Query.init(DatastorePb.java:1185) at com.google.apphosting.api.DatastorePb$Query $1.init(DatastorePb.java:2677) at com.google.apphosting.api.DatastorePb $Query.clinit(DatastorePb.java:2677) at com.google.appengine.api.datastore.QueryTranslator.convertToPb(QueryTranslator.java: 28) at com.google.appengine.api.datastore.PreparedQueryImpl.convertToPb(PreparedQueryImpl.java: 151) at com.google.appengine.api.datastore.PreparedQueryImpl.runQuery(PreparedQueryImpl.java: 111) at com.google.appengine.api.datastore.PreparedQueryImpl.asQueryResultIterator(PreparedQueryImpl.java: 89) at com.google.appengine.api.datastore.BasePreparedQuery $2.iterator(BasePreparedQuery.java:45) at com.google.appengine.api.datastore.BasePreparedQuery $2.iterator(BasePreparedQuery.java:42) at org.datanucleus.store.appengine.query.RuntimeExceptionWrappingIterable.iterator(RuntimeExceptionWrappingIterable.java: 42) at org.datanucleus.store.appengine.query.LazyResult.init(LazyResult.java: 67) at org.datanucleus.store.appengine.query.StreamingQueryResult.init(StreamingQueryResult.java: 63) at org.datanucleus.store.appengine.query.DatastoreQuery.newStreamingQueryResultForEntities(DatastoreQuery.java: 399) at org.datanucleus.store.appengine.query.DatastoreQuery.wrapEntityQueryResult(DatastoreQuery.java: 372) at org.datanucleus.store.appengine.query.DatastoreQuery.fulfillEntityQuery(DatastoreQuery.java: 364) at org.datanucleus.store.appengine.query.DatastoreQuery.executeQuery(DatastoreQuery.java: 265) at org.datanucleus.store.appengine.query.DatastoreQuery.performExecute(DatastoreQuery.java: 228) at org.datanucleus.store.appengine.query.JDOQLQuery.performExecute(JDOQLQuery.java: 85) at org.datanucleus.store.query.Query.executeQuery(Query.java:1489) at org.datanucleus.store.query.Query.executeWithArray(Query.java: 1371) at org.datanucleus.jdo.JDOQuery.execute(JDOQuery.java:243) at com.dominity.apac.transfer.dao.impl.AbstractBasicDAO.getByField(AbstractBasicDAO.java: 162) at com.dominity.apac.transfer.dao.impl.GoogleUserDAO.getByField(GoogleUserDAO.java: 35) at com.dominity.apac.transfer.service.impl.AbstractEntityService.getByField(AbstractEntityService.java: 185) at com.dominity.apac.transfer.servlet.ServletUtil.obtainAllEventsForUser(ServletUtil.java: 790) at com.dominity.apac.transfer.servlet.ReportGenerationServlet.doPost(ReportGenerationServlet.java: 200) at javax.servlet.http.HttpServlet.service(HttpServlet.java:713) at javax.servlet.http.HttpServlet.service(HttpServlet.java:806) at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java: 487) at org.mortbay.jetty.servlet.ServletHandler $CachedChain.doFilter(ServletHandler.java:1093) at
Re: [appengine-java] Do I still need to use session if I use google user account to authenticate?
Perhaps you'd better use your own userssion with one pojo class I don't think you would sacrifice User service (and its scalability) to deal with the concern opok posted below. Hi opok, I notice that the user service does not need HttpServletRequest to get the current context, is that reliable? Your app might running on multiple VM's, so using Google service is more reliable than your own implementation, I guess. I think you might want to check docs on Google account ( http://code.google.com/appengine/docs/java/users/) and also on how to use session provided by App Engine ( http://code.google.com/appengine/docs/java/config/appconfig.html#Enabling_Sessions ) My thought is, your user logged on to your GAE app already, they would need to log out of your app first, in order to log on that app with another ID, using the same browser. In this thread, Ikai (Google) explained what was shared when you're using the service ( https://groups.google.com/group/google-appengine-java/browse_thread/thread/816f81da16ca4ce8/844655a8f604d980?lnk=raot ) and guidance on how to retain form data ( http://groups.google.com/group/google-appengine-java/browse_thread/thread/7b752a5dfabd4bd0/ed596f644d23a656?lnk=raot ) You just need to google the group... On Mon, Mar 1, 2010 at 9:20 AM, yjun hu itswa...@gmail.com wrote: Perhaps you'd better use your own userssion with one pojo class On Mon, Mar 1, 2010 at 9:49 AM, opok vir...@gmail.com wrote: I currently use Google Account to authenticate and get the current user like this: UserService userAction = UserServiceFactory.getUserService(); User user = userAction.getCurrentUser(); I notice that the user service does not need HttpServletRequest to get the current context, is that reliable? What about my customer use another google id to login in another page of my app? Would the current user change when the customer returned to the first page to make some other requests ? In the past, I always use Session to storage user information to id current user, it looks like Google's user service can provide the same functionality, so I can abandon the session for that kind of usage, is that correct? -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.comgoogle-appengine-java%2bunsubscr...@googlegroups.com . For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en. -- dream or truth -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.comgoogle-appengine-java%2bunsubscr...@googlegroups.com . For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en. -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
Re: [appengine-java] I'm have a question about Java runtime
I think you can start reading the guide, let me google that for you... http://code.google.com/appengine/docs/java/datastore/ 2010/2/22 Ngô Chí Lê lengo...@gmail.com Hi, I'm a new IT, I'm working on Google App Engine using Eclipse, I have two questions for you: 1/I want to create two entities and use one-to-one relationships, how can I do that, please help me? 2/I want to insert a new entity from child, how can I do that, please help me? -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.comgoogle-appengine-java%2bunsubscr...@googlegroups.com . For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en. -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
Re: [appengine-java] Re: JPA with database
Beside useful hint from Jake, providing links by google search might be helpful to you http://tinyurl.com/cofmen Specifically, you might need to look into Get Started guide... On Fri, Feb 12, 2010 at 4:12 PM, maheswari maheswari rma...@gmail.comwrote: is their is any authentication required to run JPA Program that uses the Database as Google App Engine On Fri, Feb 12, 2010 at 11:40 AM, maheswari maheswari rma...@gmail.comwrote: hai Thanks for your reply But I didnot know where to create a new JPA Project to make databese connection with google app engine, which option i need go, JPA project,web application project or dynamic web project. Thanks in advance On Fri, Feb 12, 2010 at 4:13 AM, Jake jbrooko...@cast.org wrote: It's true that you should read the documentation. As a former newbie and teacher, though, I appreciate the need for some helpful hints: JPA is Java's Persistence (Saving) API found in the javax.persistence.* package. You can use JDO as an alternative, though, instead of JPA. I would recommend this simply because Google App Engine has better documentation for JDO. In the end, to the new user, they are essentially the same. JPA or JDO is how you will save full Java objects into the Google database. It is not difficult to make the database connection if you follow the tutorials. At this stage, it sounds like you will have more trouble creating a basic web application. So, I would start with that first - also in the tutorials. The App Engine SDK comes with a few sample projects that should work out of the box - see if you can get those up and running. Good luck! Jake On Feb 11, 1:38 pm, datanucleus andy_jeffer...@yahoo.com wrote: Really sounds like you ought to read the docs before using the softwarehttp://code.google.com/appengine/docs/ Omitting such a basic step is not advisable. -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.comgoogle-appengine-java%2bunsubscr...@googlegroups.com . For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en. -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.comgoogle-appengine-java%2bunsubscr...@googlegroups.com . For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en. -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
Re: [appengine-java] how to share local_db.bin to others
http://code.google.com/appengine/docs/java/howto/unittesting.html#Writing_Datastore_Tests I wonder if your team members can share same test case and local_db.bin in each of your environment can have similar record. I just read it, so please try and advise if it work. Thanks -Chau On Wed, Feb 3, 2010 at 8:23 PM, dreamy dreamy2c...@gmail.com wrote: we have 4 membership in google app engine project. we code in local Machine and manager source by subverion, in devolop ,when some one create a record(eg.create a company object) but others membership can't use this company object. is there any way to share local_db.bin to each other or all membership use same local_db.bin ? -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.comgoogle-appengine-java%2bunsubscr...@googlegroups.com . For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en. -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
Re: [appengine-java] Question: best practice to persist medium-large data?
Thanks John and Jeff for sharing the knowledge. I've just quickly scanned your project home, and I have a novice question that needs your help: Is twig or Objectify direct replacement to JDO / JPA on GAE? I just need to use your framework alone, or should use in combination with JDO / JPA support? What is about the approach implementing general JDO / JPA fit to Datastore? Is there a chance Google provide a specific implementation to their Datastore? Maybe someone from Google can advise on this? Thanks, -Chau On Tue, Jan 26, 2010 at 2:52 PM, John Patterson jdpatter...@gmail.comwrote: On 26 Jan 2010, at 13:37, Jeff Schnitzer wrote: I can't resist a conversation about framework design philosophy :-) Oh go on then. Just a quickie. This sort of binding (property of ListPhoto) can be convenient in some applications, and as a longtime Hibernate user I got used to working like this. But I don't like this abstraction in AppEngine. Yes, for some apps you might be able to remove the pollution of framework classes like Key (or OKey), but it comes with a price. Twig and Objectify operate at very different levels of abstraction. With Objectify you code at a lower level very aware of what is happening at the datastore level. It involves more work but, as you point out, if something goes wrong - it goes wrong in your own code where you are in a better position to handle it. With Twig you operate at a higher level that makes the persistence layer almost completely transparent. One major advantage of this is that you can change the way the data is stored (i.e. embedded or separate entity) without changing your code. Making such a change with Objectify means you need to rewrite your reference handling code yourself. A one-to-many relationship between Album and Photo has several standard representations in AppEngine: * The Photo could have a Key property pointing to Album * The Photo could have a parent ancestor in its Key which points to the Album * The Album entity could have a ListKey property pointing to its Photos Each choice has a dramatic impact on performance, what can be done in a transaction, and how you do queries that simply cannot be glossed over or abstracted away. This is why you configure what type of relationship is used using: @Embed, @Entity(PARENT), @Entity(CHILD) or @Entity(INDEPENDENT) So you have the flexibility to choose configuration _without_ rewriting your code. Very important difference. Currently the first type of representation is not an option. I do want to add this as it makes very large collections that change often much more efficient. When it is added you could reconfigure your data schema by changing a single annotation. Such a change in Objectify would require the developer to rewrite their entire data layer Which does the ListPhoto represent? Furthermore, is ListPhoto a proxy or did the photos get fetched along with the Album? Can I serialize the Album or do I need to detach it? Yes instances are just normal POJOs so no problems serializing. I do this myself with GWT. Currently, lazy references are not supported... its a very important feature on the TODO list. Even worse, there are also two more possible representations: * The Photo could have a Key property (or ancestor) pointing to an Album that does not exist An inconsistent datastore is a problem with any framework - including Objectify. The trick is to use transactions where possible whenever working on an entity group to avoid getting this situation in the first place. * The Album could have a ListKey property, and some of the Keys could point to Photos that do not exist As above. An exception would be thrown saying which property on what object could not be found. Maybe these are degenerate cases, maybe not, but you'll never be able to completely avoid them. RDBMSes have transactions and referential integrity constraints that guarantee these later two cases can't happen. Not so in AppEngine. You're just one DatastoreTimeoutException away from having to deal with this situation in your code. If your data is inconsistent you have a problem - whether the framework throws an exception (as in Twig) or if you receive a null back from a finder method (as in Objectify) there is really not much difference. You still have to clean up the mess. This is the big mess that makes JDO on Appengine so complicated, possibly even more complicated than it is on an RDBMS. On the other hand... if you simply expose the Key (or OKey), the developer does a little more work but doesn't have to figure out all the configuration. Without proxies, all entities are serializable and GWT-able without any special consideration. I think that for simple cases and small data models working with Keys and handling the references yourself is fine. When things get more complicated it is easier to reconfigure how the data is actually
Re: [appengine-java] Deploy from separated resources
I'm just curious how you share code among your team without using subversion? -Chau On Tue, Jan 19, 2010 at 10:38 PM, dominity domin...@gmail.com wrote: Hi, guys. I've got one simple question. There is team of developers that creates any kind of web application. Web application is hosted on GAE. Team's members are from different locations. Any member of team can deploy new version of app. How should they behave in this situation to avoid version collisions? How should new version be deployed? Are there any suggestions, tips, best practices or something like that? Also, is there any possibility to upload to GAE only static file of the project, but not whole project? Best regards, Alexander. -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.comgoogle-appengine-java%2bunsubscr...@googlegroups.com . For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en. -- You received this message because you are subscribed to the Google Groups "Google App Engine for Java" group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
Re: [appengine-java] Re: String as Primary key in JDO
Queries must go with indexes ( http://code.google.com/appengine/docs/java/datastore/queriesandindexes.html) For the column, you can store it as lowercase/uppercase, For the display column, you can store the original value. On Sun, Jan 17, 2010 at 2:15 PM, Sahil Mahajan sahilm2...@gmail.com wrote: Isn't there any other way. I want to avoid toLowerCase(). I want String to be case insensitive for database, but while displaying String to user I would like it to conserve case.. I can compare strings through equalsIgnoreCase. But then I won't be able to make effective use of primary key. On Jan 17, 11:34 am, jd jdpatter...@gmail.com wrote: Just String#toLowerCase() the key when you store them On Jan 17, 1:11 am, sahil mahajan sahilm2...@gmail.com wrote: I am using String as primary key in JDO. But it is case sensitive. It considers name and NAME as different. Can I make it case sensitive? -- Regards Sahil Mahajan -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.comgoogle-appengine-java%2bunsubscr...@googlegroups.com . For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en. -- You received this message because you are subscribed to the Google Groups "Google App Engine for Java" group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
Re: [appengine-java] jdoql contains method
http://code.google.com/appengine/docs/java/datastore/queriesandindexes.html#Introducing_Queries In Query Filters section, it mentions that A filter specifies a field name, an operator, and a value. The value must be provided by the app; it cannot refer to another field, or be calculated in terms of other fields. so it seems to me desc.contains(ing) filter might cause the issue. On Sun, Dec 27, 2009 at 4:19 AM, zackmac zack.macom...@gmail.com wrote: I'm trying to use the contains method in a query and having some trouble. The query is formatted like this: select from Transactions where userName == 'auser' account == 'anAccount' desc.contains(ing) order by transDate desc, categoryName desc is a column in my Transactions table. Don't think I'm quite understanding how the contains method works and how to implement in a query. I get this error returned on my jsp when I try to run that query: org.datanucleus.store.appengine.query.DatastoreQuery $UnsupportedDatastoreFeatureException: Problem with query -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.comgoogle-appengine-java%2bunsubscr...@googlegroups.com . For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en. -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
